Found 35 papers in cond-mat Vortices are point-like topological defects in superconductors whose motion
dictates superconducting properties and controls device performance. In
superconductor-ferromagnet heterostructures, vortices interact with topological
defects in the ferromagnet such as line-like domain walls. While in previous
heterostructure generations, vortex-domain wall interactions were mediated by
stray fields; in new heterostructure families, more important become exchange
fields and spin-orbit coupling. However, spin-orbit coupling's role in
vortex-domain wall interactions remains unexplored. Here we uncover, via
numerical simulations and Ginzburg-Landau theory, that Rashba spin-orbit
coupling induces magnetoelectric interactions between vortices and domain walls
that crucially depend on the wall's winding direction$-$its helicity. The
wall's helicity controls whether vortices are pushed or dragged by N\'eel
walls, and their gliding direction along Bloch walls. Our work capitalizes on
interactions between topological defects from different order parameters and of
different dimensionality to engineer enhanced functionality.
We study the dynamical response of vacancy-induced quasiparticle excitations
in the site-diluted Kitaev spin liquid with a magnetic field. Due to the
flux-binding effect and the emergence of dangling Majorana fermions around each
spin vacancy, the low-energy physics is governed by a set of vacancy-induced
quasi-zero-energy modes. These localized modes result in unique characteristics
of the dynamical spin correlation functions, which intriguingly mimic the
single-quasiparticle density of states and further exhibit a
quasi-zero-frequency peak. By recognizing the potential observability of these
local correlation functions via scanning tunneling microscopy (STM), we show
how the STM response is sensitive to the local flux configuration, the magnetic
field strength, and the vacancy concentration. Constructing a simple model of
the localized modes, we also elucidate how the local correlation functions can
be interpreted in terms of the hybridization between these modes.
We consider the topological stabilizer code and Floquet code defined on a
non-orientable surface, which can be considered as families of codes extending
Shor's 9-qubit code. We investigate the fault-tolerant logical gates of the
$\mathbb{Z}_2$ toric code in this setup, which corresponds to $e\leftrightarrow
m$ exchanging symmetry of the underlying $\mathbb{Z}_2$ gauge theory. We find
that non-orientable geometry provides a new way the emergent symmetry acts on
the code space, and discover the new realization of the fault-tolerant Hadamard
gate of 2d $\mathbb{Z}_2$ toric code on a surface with a single cross-cap,
dubbed an $\mathbb{RP}^2$ code. This Hadamard gate can be realized by a
constant-depth local unitary circuit modulo non-locality caused by a cross-cap,
thus reduces the error propagation and eliminates the problem of the
factor-of-two distance reduction compared with the previously known realization
on a surface code. Via folding, the $\mathbb{RP}^2$ code can be turned into a
bilayer local quantum code, where the folded cross-cap is equivalent to a
bi-layer twist terminated on a gapped boundary and the logical Hadamard only
contains local gates with intra-layer couplings. We further obtain the complete
logical Clifford gate set for a stack of $\mathbb{RP}^2$ codes. We then
construct the honeycomb Floquet code in the presence of a single cross-cap, and
find that the period of the sequential Pauli measurements acts as a $HZ$
logical gate on the single logical qubit, where the cross-cap enriches the
dynamics compared with the orientable case. We find that the dynamics of the
honeycomb Floquet code is precisely described by a condensation operator of the
$\mathbb{Z}_2$ gauge theory, and illustrate the exotic dynamics of our code in
terms of a condensation operator supported at a non-orientable surface.
We present low-temperature magnetoconductance measurements on
Bi$_{1.5}$Sb$_{0.5}$Te$_{1.8}$Se$_{1.2}$ kinks with ribbon-shaped legs. The
conductance displays a clear dependence on the in-plane magnetic field
orientation. The conductance modulation is consistent with orbital
effect-driven trapping of the topological surface states on different side
facets of the legs of the kink, which affects their transmission across the
kink. This magnetic field-driven trapping and conductance pattern can be
explained with a semiclassical picture and is supported by quantum transport
simulations. The interpretation is corroborated by varying the angle of the
kink and analyzing the temperature dependence of the observed
magnetoconductance pattern, indicating the importance of phase coherence along
the cross section perimeter of the kink legs.
Combining the synthetic tunability of molecular compounds with the optical
selection rules of transition metal dichalcogenides (TMDC) that derive from
spin-valley coupling could provide interesting opportunities for the readout of
quantum information. However, little is known about the electronic and spin
interactions at such interfaces and the influence on spin-valley relaxation. In
this work we investigate various heterojunctions of vanadyl phthalocyanine
(VOPc) thermally evaporated on WSe$_2$ and find that local ordering of the
molecular layer plays an important role in the electronic perturbation of
WSe$_2$, which in turn directly influences the spin-valley polarization
lifetime. A thin molecular layer results in a hybrid state which destroys the
spin-valley polarization almost instantaneously, whereas a thicker molecular
layer with well-defined local ordering shows minimal electronic perturbation
and results in longer-lived spin-valley polarization than the WSe$_2$ monolayer
alone.
We consider quantum jump trajectories of Markovian open quantum systems
subject to stochastic in time resets of their state to an initial
configuration. The reset events provide a partitioning of quantum trajectories
into consecutive time intervals, defining sequences of random variables from
the values of a trajectory observable within each of the intervals. For
observables related to functions of the quantum state, we show that the
probability of certain orderings in the sequences obeys a universal law. This
law does not depend on the chosen observable and, in case of Poissonian reset
processes, not even on the details of the dynamics. When considering (discrete)
observables associated with the counting of quantum jumps, the probabilities in
general lose their universal character. Universality is only recovered in cases
when the probability of observing equal outcomes in a same sequence is
vanishingly small, which we can achieve in a weak reset rate limit. Our results
extend previous findings on classical stochastic processes [N.~R.~Smith et al.,
EPL {\bf 142}, 51002 (2023)] to the quantum domain and to state-dependent reset
processes, shedding light on relevant aspects for the emergence of universal
probability laws.
The realization of topological insulators induced by correlation effects is
one of the main issues of modern condensed matter physics. An intriguing
example of the correlated topological insulators is a magnetic Chern insulator
induced by a noncoplanar multiple-Q magnetic order. Although the realization of
the magnetic Chern insulator has been studied in the classical limit of the
Kondo lattice model, research on the magnetic Chern insulator in the original
Kondo lattice model is limited. Here, we investigate the possibility of the
many-body Chern insulator with the noncoplanar triple-Q magnetic order in the
Kondo lattice model on a triangular lattice. Using the many-variable
variational Monte Carlo method, we reveal that the triple-Q magnetic order
becomes a ground state at quarter filling in an intermediate Kondo coupling
region. We also show that the many-body Chern number is quantized to one in the
triple-Q magnetic ordered phase utilizing the polarization operators. Our
results provide a pathway for the realization of the many-body Chern insulator
in correlated electron systems.
A series of Fe$_x$Rh$_{100-x}$ ($30 \leq x \leq 57$) films were epitaxially
grown using magnetron sputtering, and were systematically studied by
magnetization-, electrical resistivity-, and Hall resistivity measurements.
After optimizing the growth conditions, phase-pure Fe$_{x}$Rh$_{100-x}$ films
were obtained, and their magnetic phase diagram was revisited. The
ferromagnetic (FM) to antiferromagnetic (AFM) transition is limited at narrow
Fe-contents with $48 \leq x \leq 54$ in the bulk Fe$_x$Rh$_{100-x}$ alloys. By
contrast, the FM-AFM transition in the Fe$_x$Rh$_{100-x}$ films is extended to
cover a much wider $x$ range between 33 % and 53 %, whose critical temperature
slightly decreases as increasing the Fe-content. The resistivity jump and
magnetization drop at the FM-AFM transition are much more significant in the
Fe$_x$Rh$_{100-x}$ films with $\sim$50 % Fe-content than in the Fe-deficient
films, the latter have a large amount of paramagnetic phase. The
magnetoresistivity (MR) is rather weak and positive in the AFM state, while it
becomes negative when the FM phase shows up, and a giant MR appears in the
mixed FM- and AFM states. The Hall resistivity is dominated by the ordinary
Hall effect in the AFM state, while in the mixed state or high-temperature FM
state, the anomalous Hall effect takes over. The absence of topological Hall
resistivity in Fe$_{x}$Rh$_{100-x}$ films with various Fe-contents implies that
the previously observed topological Hall effect is most likely extrinsic. We
propose that the anomalous Hall effect caused by the FM iron moments at the
interfaces nicely explains the hump-like anomaly in the Hall resistivity. Our
systematic investigations may offer valuable insights into the spintronics
based on iron-rhodium alloys.
Zirconium pentatelluride (ZrTe$_{5}$), a system with a Dirac linear band
across the Fermi level and anomalous transport features, has attracted
considerable research interest for it is predicted to be located at the
boundary between strong and weak topological insulators separated by a
topological semimetal phase. However, the experimental verification of the
topological phase transition and the topological ground state in ZrTe$_{5}$ is
full of controversies, mostly due to the difficulty of precisely capturing the
small gap evolution with single-particle band structure measurements.
Alternatively, the collective excitations of electric charges, known as
plasmons, in Dirac systems exhibiting unique behavior, can well reflect the
topological nature of the band structure. Here, using reflective
high-resolution electron energy loss spectroscopy (HREELS), we investigate the
temperature-dependent collective excitations of ZrTe$_{5}$, and discover that
the plasmon energy in ZrTe$_{5}$ is proportional to the $1/3$ power of the
carrier density $n$, which is a unique feature of plasmons in three-dimensional
Dirac systems \lyxadded{51189}{Wed Sep 13 06:29:07 2023}{or hyperbolic
topological insulators}. Based on this conclusion, the origin of the
resistivity anomaly of ZrTe$_{5}$ can be attributed to the
temperature-dependent chemical potential shift in extrinsic Dirac semimetals.
Heterostructures comprised of two two-dimensional electron systems (2DES)
separated by a dielectric exhibit resonant tunneling when the band structures
of both systems are aligned. It is commonly assumed that the height and width
of the resonant peak in the tunneling current is determined by electron
scattering and rotational misalignment of crystal structures of the 2DES. We
identify two fundamental factors limiting the maximum height and steepness of
the resonance: coupling to contacts and tunnel splitting of energy levels. The
upper limit of the tunneling current is the number of electrons available for
tunneling times half the tunnel coupling between the 2DES. As a result of a
tradeoff between the contact-induced level broadening and contact resistance,
the maximum current is only achievable when the coupling to contacts equals the
tunnel level splitting. According to our model calculations, the limiting
behavior can be observed in double-gated graphene/few-layer hexagonal boron
nitride/graphene heterostructures.
Frequency mixing processes in spin systems have a variety of applications in
meteorology and in quantum data processing. Spin spectroscopy based on
frequency mixing offers some advantages, including the ability to eliminate
crosstalk between driving and detection. We experimentally explore nonlinear
frequency mixing processes with negatively charged nitrogen-vacancy defects in
diamond at low temperatures, and near level anti crossing. The experimental
setup allows simultaneously applying magnetic driving in the longitudinal and
transverse directions. Magnetic resonance detection is demonstrated using both
Landau Zener St\"uckelberg interferometry and two-tone driving spectroscopy.
The experimental results are compared with predictions of a theoretical
analysis based on the rotating wave approximation.
Superfluidity is a well-characterized quantum phenomenon which entails
frictionless-motion of mesoscopic particles through a superfluid, such as
$^4$He or dilute atomic-gases at very low temperatures. As shown by Landau, the
incompatibility between energy- and momentum-conservation, which ultimately
stems from the spectrum of the elementary excitations of the superfluid,
forbids quantum-scattering between the superfluid and the moving mesoscopic
particle, below a critical speed-threshold. Here we predict that
frictionless-motion can also occur in the absence of a standard superfluid,
i.e. when a He atom travels through a narrow (5,5) carbon-nanotube (CNT). Due
to the quasi-linear dispersion of the plasmon and phonon modes that could
interact with He, the (5,5) CNT embodies a solid-state analog of the
superfluid, thereby enabling straightforward transfer of Landau's criterion of
superfluidity. As a result, Landau's equations acquire broader generality, and
may be applicable to other nanoscale friction phenomena, whose description has
been so far purely classical.
The nanoscale contrast in scattering-type scanning near-field optical
microscopy (s-SNOM) is determined by the optical properties of the sample
immediately under the apex of the tip of the atomic force microscope (AFM).
There are several models that describe the optical scattering of an incident
field by the tip near a surface, and these models have been successful in
relating the measured scattering signal to the dielectric function of the
sample under the tip. Here, we address a situation that is normally not
considered in the existing interaction models, namely the near-field signal
arising from thin, highly conductive films in the terahertz (THz) frequency
range. According to established theoretical models, highly conductive thin
films should show insignificant contrast in the THz range for small variations
in conductivity, therefore hindering the use of s-SNOM for nanoscale
characterisation. We experimentally demonstrate unexpected but clear and
quantifiable layer contrast in the THz s-SNOM signal from few-layer exfoliated
graphene as well as subtle nanoscale contrast variations within graphene
layers. We use finite-element simulations to confirm that the observed contrast
is described by the classical electromagnetics of the scattering mechanism,
suggesting that the dipole models must be reformulated to correctly describe
the interaction with conductive samples.
Under relaxation time approximation, we obtain an iterative solution to the
relativistic Boltzmann equation in generic stationary spacetime. This solution
provides a scheme to study non-equilibrium system order by order. As a specific
example, we analytically calculated the covariant expressions of the particle
flow and the energy momentum tensor up to the first order in relaxation time.
Finally and most importantly, we present all 14 kinetic coefficients for a
neutral system, which are verified to satisfy the Onsager reciprocal relation
and guarantee a non-negative entropy production.
In this article, we systematically explore several key properties of
electronic states in helical materials systems, including the inheritance of
orbital angular momentum (OAM) from local atomic orbitals to the entire helical
structure, the conservation of helical momentum, and the emergence of
helical-induced spin-orbit coupling (hSOC). We then apply this comprehensive
theoretical framework to elucidate the electronic structure of one-dimensional
(1D) helical crystal InSeI. Our analysis reveals the influence of hSOC, evident
in spin-mixing energy gaps within the electronic band structure, as calculated
through density functional theory. Utilizing a combination of tight-binding
modeling and first-principles calculations, we ascertain the spin-polarized
electric response and the chiral-switchable second-order photocurrent response
of InSeI, characterized as the Landauer-Buttiker ballistic transport and shift
current response. The results highlight the potential of 1D InSeI for
applications in spintronics and optoelectronics. The overarching theoretical
framework established in this work will prove invaluable for the investigation
of other helical electronic systems.
Metals can undergo geometric quantum phase transitions where the local
curvature of the Fermi surface changes sign without a change in symmetry or
topology. At the inflection points on the Fermi surface, the local curvature
vanishes, leading to an anomalous dynamics of quasiparticles. In this paper, we
study geometric quantum critical metals that support inflection points in two
dimensions, and show that the decay rate of quasiparticles goes as $E^{\alpha}$
with $1<\alpha<2$ as a function of quasiparticle energy $E$ at the inflection
points.
The Su-Schrieffer-Heeger (SSH) chain is the reference model of a
one-dimensional topological insulator. Its topological nature can be explained
by the quantization of the Zak phase, due to reflection symmetry of the unit
cell, or of the winding number, due to chiral symmetry. Here, we harness recent
graph-theoretical results to construct families of setups whose unit cell
features neither of these symmetries, but instead a so-called latent or hidden
reflection symmetry. This causes the isospectral reduction -- akin to an
effective Hamiltonian -- of the resulting lattice to have the form of an SSH
model. As we show, these latent SSH models exhibit features such as multiple
topological transitions and edge states, as well as a quantized Zak phase.
Relying on a generally applicable discrete framework, we experimentally
validate our findings using electric circuits.
Moir\'e Engineering offers an exceptional foundation for creating
controllable systems that display strongly correlated physics. The central
focus is on isolated flat bands near the Fermi level, stemming from the
pseudo-Landau levels of the massless or massive Dirac fermions. Unlike spin-1/2
fermions, both the Lieb and Dice lattices host triply degenerate spin-1
fermions as the low-energy effective quasi-particles. In this letter, we
propose Moir\'e structures, respectively, of the twisted bilayer Lieb and Dice
lattices, which exhibit tunable numbers of isolated flat bands near the Fermi
level. The quantity of isolated flat bands directly relates to the size of the
Moir\'e supercell, for they originate from the flat bands of the bipartite Lieb
or Dice lattice. These flat bands remain isolated from the high-energy bands
even with small higher-order term and chiral-symmetry breaking interlayer
tunneling considered. At a small twist angle, thousands of isolated flat bands
can be generated by the Moir\'e pattern, which significantly amplifies the flat
band physics. The dramatic change in the number of flat bands in the Moir\'e
Brillouin zone as the twist angle varies gives rise to a new platform to
effectively manipulate the strongly correlated physics. Moreover, via the
investigation of the systems, we have demonstrated that these isolated flat
bands exhibit considerable quantum weight, indicating a notable superfluid
weight upon adding BCS-type pairing potential. Further, the density-of-state
around the Fermi level as a function of the twisted angle contributed by these
flat bands implies a tunable critical temperature for BCS superconductivity.
Most importantly, through twisted bilayer Lieb lattice and twisted Dice
lattice, we demonstrate that the Moir\'e engineering of bipartite lattices
creates a brand new path toward the engineering of the flat-band generation.
In this article we generalize the Bohr-Sommerfeld rule for scalar symbols at
a potential well to matrix-valued symbols having eigenvalues that may coalesce
precisely at the bottom of the well. As an application, we study the existence
of approximately flat bands in moir\'e heterostructures such as strained
two-dimensional honeycomb lattices in a model recently introduced by Timmel and
Mele.
The duration of bidirectional transfer protocols in 1D topological models
usually scales exponentially with distance. In this work, we propose transfer
protocols in multidomain SSH chains and Creutz ladders that lose the
exponential dependence, greatly speeding up the process with respect to their
single-domain counterparts, reducing the accumulation of errors and drastically
increasing their performance, even in the presence of symmetry-breaking
disorder. We also investigate how to harness the localization properties of the
Creutz ladder-with two localized modes per domain wall-to choose the two states
along the ladder that will be swapped during the transfer protocol, without
disturbing the states located in the intermediate walls between them. This
provides a 1D network with all-to-all connectivity that can be helpful for
quantum information purposes.
We construct Pauli topological subsystem codes characterized by arbitrary
two-dimensional Abelian anyon theories--this includes anyon theories with
degenerate braiding relations and those without a gapped boundary to the
vacuum. Our work both extends the classification of two-dimensional Pauli
topological subsystem codes to systems of composite-dimensional qudits and
establishes that the classification is at least as rich as that of Abelian
anyon theories. We exemplify the construction with topological subsystem codes
defined on four-dimensional qudits based on the $\mathbb{Z}_4^{(1)}$ anyon
theory with degenerate braiding relations and the chiral semion theory--both of
which cannot be captured by topological stabilizer codes. The construction
proceeds by "gauging out" certain anyon types of a topological stabilizer code.
This amounts to defining a gauge group generated by the stabilizer group of the
topological stabilizer code and a set of anyonic string operators for the anyon
types that are gauged out. The resulting topological subsystem code is
characterized by an anyon theory containing a proper subset of the anyons of
the topological stabilizer code. We thereby show that every Abelian anyon
theory is a subtheory of a stack of toric codes and a certain family of twisted
quantum doubles that generalize the double semion anyon theory. We further
prove a number of general statements about the logical operators of translation
invariant topological subsystem codes and define their associated anyon
theories in terms of higher-form symmetries.
Two geometric phases of mixed quantum states, known as the interferometric
phase and Uhlmann phase, are generalizations of the Berry phase of pure states.
After reviewing the two geometric phases and examining their parallel-transport
conditions, we specify a class of cyclic processes that are compatible with
both conditions and therefore accumulate both phases through their definitions,
respectively. Those processes then facilitate a fair comparison between the two
phases. We present exact solutions of two-level and three-level systems to
contrast the two phases. While the interferometric phase exhibits
finite-temperature transitions only in the three-level system but not the
two-level system, the Uhlmann phase shows finite-temperature transitions in
both cases. Thus, using the two geometric phases as finite-temperature
topological indicators demonstrates the rich physics of topology of mixed
states.
We establish a general mapping from one-dimensional non-Hermitian mosaic
models to their non-mosaic counterparts. This mapping can give rise to mobility
edges and even Lyapunov exponents in the mosaic models if critical points of
localization or Lyapunov exponents of localized states in the corresponding
non-mosaic models have already been analytically solved. To demonstrate the
validity of this mapping, we apply it to two non-Hermitian localization models:
an Aubry-Andr\'e-like model with nonreciprocal hopping and complex
quasiperiodic potentials, and the Ganeshan-Pixley-Das Sarma model with
nonreciprocal hopping. We successfully obtain the mobility edges and Lyapunov
exponents in their mosaic models. This general mapping may catalyze further
studies on mobility edges, Lyapunov exponents, and other significant quantities
pertaining to localization in non-Hermitian mosaic models.
EuCd$_2$As$_2$ is now widely accepted as a topological semimetal in which a
Weyl phase is induced by an external magnetic field. We challenge this view
through firm experimental evidence using a combination of electronic transport,
optical spectroscopy and excited-state photoemission spectroscopy. We show that
the EuCd$_2$As$_2$ is in fact a semiconductor with a gap of 0.77 eV. We show
that the externally applied magnetic field has a profound impact on the
electronic band structure of this system. This is manifested by a huge decrease
of the observed band gap, as large as 125~meV at 2~T, and consequently, by a
giant redshift of the interband absorption edge. However, the semiconductor
nature of the material remains preserved. EuCd$_2$As$_2$ is therefore a
magnetic semiconductor rather than a Dirac or Weyl semimetal, as suggested by
{\em ab initio} computations carried out within the local spin-density
approximation.
Quasicrystals (materials with long range order but without the usual spatial
periodicity of crystals) were discovered in several soft matter systems in the
last twenty years. The stability of quasicrystals has been attributed to the
presence of two prominent length scales in a specific ratio, which is 1.93 for
the twelve-fold quasicrystals most commonly found in soft matter. We propose
design criteria for block copolymers such that quasicrystal-friendly length
scales emerge at the point of phase separation from a melt, basing our
calculations on the Random Phase Approximation. We consider two block copolymer
families: linear chains containing two different monomer types in blocks of
different lengths, and ABC star terpolymers. In all examples, we are able to
identify parameter windows with the two length scales having a ratio of 1.93.
The models that we consider that are simplest for polymer synthesis are, first,
a monodisperse A_L B A_S B melt and, second, a model based on random reactions
from a mixture of A_L, A_S and B chains: both feature the length scale ratio of
1.93 and should be relatively easy to synthesise.
We present effective field theories for dipole symmetric topological matters
that can be described by the Chern-Simons theory. Unlike most studies using
higher-rank gauge theory, we develop a framework with both U(1) and dipole
gauge fields. As a result, only the highest multipole symmetry can support the
't Hooft anomaly. We show that with appropriate point group symmetries, the
dipolar Chern-Simons theory can exist in any dimension and, moreover, the
bulk-edge correspondence can depend on the boundary. As two applications, we
draw an analogy between the dipole anomaly and the torsional anomaly and
generalize particle-vortex duality to dipole phase transitions. All of the
above are in the flat spacetime limit, but our framework is able to
systematically couple dipole symmetry to curved spacetime. Based on that, we
give a proposal about anomalous dipole hydrodynamics. Moreover, we show that
the fracton-elasticity duality arises naturally from a non-abelian Chern-Simons
theory in 3D.
We study the quantum Hall effect in a two-dimensional homogeneous electron
gas coupled to a quantum cavity field. As initially pointed out by Kohn,
Galilean invariance for a homogeneous quantum Hall system implies that the
electronic center of mass (CM) decouples from the electron-electron
interaction, and the energy of the CM mode, also known as Kohn mode, is equal
to the single particle cyclotron transition. In this work, we point out that
strong light-matter hybridization between the Kohn mode and the cavity photons
gives rise to collective hybrid modes between the Landau levels and the
photons. We provide the exact solution for the collective Landau polaritons and
we demonstrate the weakening of topological protection at zero temperature due
to the existence of the lower polariton mode which is softer than the Kohn
mode. This provides an intrinsic mechanism for the recently observed
topological breakdown of the quantum Hall effect in a cavity [Appugliese et
al., Science 375, 1030-1034 (2022)]. Importantly, our theory predicts the
cavity suppression of the thermal activation gap in the quantum Hall transport.
Our work paves the way for future developments in the cavity control of quantum
materials.
Quantum transport and localization are fundamental concepts in condensed
matter physics. It is commonly believed that in one-dimensional systems, the
existence of mobility edges is highly dependent on disorder. Recently, there
has been a debate over the existence of an exact mobility edge in a modulated
mosaic model without quenched disorder, the so-called mosaic Wannier-Stark
lattice. Here, we experimentally implement such disorder-free mosaic photonic
lattices using a silicon photonics platform. By creating a synthetic electric
field, we could observe energy-dependent coexistence of both extended and
localized states in a finite number of waveguides. The Wannier-Stark ladder
emerges when the resulting potential is strong enough, and can be directly
probed by exciting different spatial modes of the lattice. Our studies provide
the experimental proof of coexisting sets of strongly localized and conducting
(though weakly localized) states in finite-sized mosaic Wannier-Stark lattices,
which hold the potential to encode high-dimensional quantum resources with
compact and robust structures.
We present a device architecture of hybrid-edge and dual-gated quantum point
contact. We demonstrate improved electrostatic control over the separation,
position, and coupling of each broken-symmetry compressible strip in graphene.
Via low-temperature magneto-transport measurement, we demonstrate selective
manipulation over the evolution, hybridization, and transmission of arbitrarily
chosen quantum Hall states in the channel. With gate-tunable tunneling
spectroscopy, we characterize the energy gap of each symmetry-broken quantum
Hall state with high resolution on the order of ~0.1 meV.
It is shown micromagnetic and atomistic spin dynamics simulations can use
multiple GPUs in order to reduce computation time, but also to allow for a
larger simulation size than is possible on a single GPU. Whilst interactions
which depend on neighbouring spins, such as exchange interactions, may be
implemented efficiently by transferring data between GPUs using halo regions,
or alternatively using direct memory accesses, implementing the long-range
demagnetizing interaction is the main difficulty in achieving good performance
scaling, where the data transfer rate between GPUs is a significant bottleneck.
A multi-GPU convolution algorithm is developed here, which relies on single-GPU
FFTs executed in parallel. It is shown that even for micromagnetic simulations
where the demagnetizing interaction computation time dominates, good
performance scaling may be achieved, with speedup factors up to 1.8, 2.5, and
3.1, for 2, 3, and 4 GPUs respectively. The code developed here can be used for
any number of GPUs in parallel, with performance scaling strongly dependent on
inter-GPU data transfer rate and connection topology. This is further improved
in micromagnetic simulations which include a spin transport solver, obtaining
speedup factors up to 1.96, 2.8, and 3.7, for 2, 3, and 4 GPUs respectively.
The best case scenario is obtained for atomistic spin dynamics simulations,
where the demagnetizing interaction is implemented with spin-averaged cells.
Using a single workstation with 4 GPUs, it is shown atomistic spin dynamics
simulations with up to 1 billion spins, and atomistic Monte Carlo simulations
with up to 2 billion spins are possible, with a near-ideal performance scaling.
Computational materials are pivotal in advancing our understanding of
distinct material classes and their properties, offering valuable insights in
predicting novel structures and complementing experimental approaches. In this
context, Psi-graphene is a stable two-dimensional carbon allotrope composed of
5-6-7 carbon rings theoretically predicted recently. Using density functional
theory (DFT) calculations, we explored its boron nitride counterpart's
mechanical, electronic, and optical characteristics (Psi-BN). Our results
indicate that Psi-BN possesses a band gap of 4.59 eV at the HSE06 level. Phonon
calculations and ab initio molecular dynamics simulations demonstrated that
this material has excellent structural and dynamic stability. Moreover, its
formation energy is -7.48 eV. Psi-BN exhibited strong ultraviolet activity,
suggesting its potential as an efficient UV collector. Furthermore, we
determined critical mechanical properties of Psi-BN, such as the elastic
stiffness constants, Young's modulus (250-300 GPa), and Poisson ratio (0.7),
providing valuable insights into its mechanical behavior.
Linear complexions are stable defect states, where the stress field
associated with a dislocation induces a local phase transformation that remains
restricted to nanoscale dimensions. As these complexions are born at the
defects which control plasticity in metals, it is crucial to understand their
impact on subsequent mechanical properties. In this work, atomistic modeling is
used to understand how dislocation mechanics are altered by the presence of
nanoparticle array linear complexions in a Ni-Al alloy. Molecular dynamics
simulations are used to identify the critical shear stress needed to drive
dislocation breakaway, first for nanoparticle arrays formed by Monte
Carlo/molecular dynamics methods to represent realistic configurations and
subsequently for simplified models that allow the effects of particle spacing
and size to be varied in a controlled manner. A combined bowing and progressive
unpinning mechanism is uncovered, leading to the demonstration of a new
strength scaling law that differs in keys ways from classical Orowan bowing.
Copper hydroxyhalide materials herbertsmithite ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$
and Zn-barlowite ZnCu$_{3}$(OH)$_{6}$FrBr are thought to be the best
realizations of the spin-$\frac{1}{2}$ Kagome quantum antiferromagnetic
Heisenberg model and are widely believed to host a spin liquid ground state.
However, the exact nature of such a novel state of matter is still under strong
debate, partly due to the complication related to the occupation disorder
between the Zinc and the Copper ions in these systems. In particular, recent
nuclear magnetic resonance measurements indicate that the magnetic response of
the Kagome plane is significantly spatial inhomogeneous, even though the
content of the misplaced Zinc or Copper ions is believed to be very small. Here
we use extensive variational optimization to show that the well known
$U(1)$-Dirac spin liquid state is extremely sensitive to the introduction of
the nonmagnetic Zinc impurity in the Kagome plane. More specifically, we find
that the Zinc impurities can significantly reorganize the local spin
correlation pattern around them and induce strong spatial oscillation in the
magnetic response of the system. We argue that this is a general trend in
highly frustrated quantum magnet systems, in which the nonmagnetic impurity may
act as strongly relevant perturbation on the emergent resonating valence bond
structure in their spin liquid ground state. We also argue that the strong
spatial oscillation in the magnetic response should be attributed to the free
moment released by the doped Zinc ions and may serve as the smoking gun
evidence for the Dirac node in the $U(1)$ Dirac spin liquid state on the Kagome
lattice.
We investigate the finite-time behavior of pair production from the vacuum by
a time-dependent Sauter pulsed electric field using the spinor quantum
electrodynamics (QED). In the adiabatic basis, the one-particle distribution
function in momentum space is determined by utilizing the exact analytical
solution of the Dirac equation. By examining the temporal behavior of the
one-particle distribution function and the momentum spectrum of created pairs
in the sub-critical field limit $(E_0 = 0.2E_c)$, we observe oscillatory
patterns in the longitudinal momentum spectrum(LMS) of particles at finite
times. These oscillations arise due to quantum interference effects resulting
from the dynamical tunneling. Furthermore, we derive an approximate and
simplified analytical expression for the distribution function at finite times,
which allows us to explain the origin and behavior of these oscillations.
Additionally, we discuss the role of the vacuum polarization function and its
counter term to the oscillations in LMS vacuum excitation. We also analyse the
transverse momentum spectrum (TMS).
Non-Hermitian matrices are ubiquitous in the description of nature ranging
from classical dissipative systems, including optical, electrical, and
mechanical metamaterials, to scattering of waves and open quantum many-body
systems. Seminal K-theory classifications of non-Hermitian systems based on
line and point gaps have deepened the understanding of many physical phenomena.
However, ample systems remain beyond this description; reference points and
lines are in general unable to distinguish whether multiple non-Hermitian bands
exhibit band crossings and braids. To remedy this we consider the complementary
notions of non-Hermitian band gaps and separation gaps that crucially include a
broad class of multi-band scenarios, enabling the description of generic band
structures with symmetries. With these concepts, we provide a unified and
systematic classification of both gapped and nodal systems in the presence of
physically relevant parity-time ($\mathcal{PT}$) and pseudo-Hermitian
symmetries using homotopy theory. This uncovers new fragile phases and,
remarkably, also implies new stable phenomena stemming from the topology of
both eigenvalues and eigenvectors. In particular, we reveal different Abelian
and non-Abelian phases in $\mathcal{PT}$-symmetric systems, described by frame
and braid topology. The corresponding invariants are robust to
symmetry-preserving perturbations that do not close band gaps, and they also
predict the deformation rules of nodal phases. We further demonstrate that
spontaneous $\mathcal{PT}$ symmetry breaking is captured by a Chern-Euler
description, a fingerprint of unprecedented non-Hermitian topology. These
results open the door for theoretical and experimental exploration of a rich
variety of novel topological phenomena in a wide range of physical platforms.

Date of feed: Thu, 12 Oct 2023 00:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Manipulating Vortices with Domain Walls in Superconductor-Ferromagnet Heterostructures. (arXiv:2310.06866v1 [cond-mat.supr-con])**

Sebastián A. Díaz, Jonas Nothhelfer, Kjetil M. D. Hals, Karin Everschor-Sitte

**Dynamics of vacancy-induced modes in the non-Abelian Kitaev spin liquid. (arXiv:2310.06891v1 [cond-mat.str-el])**

Wen-Han Kao, Gábor B. Halász, Natalia B. Perkins

**Fault-tolerant logical gates via constant depth circuits and emergent symmetries on non-orientable topological stabilizer and Floquet codes. (arXiv:2310.06917v1 [quant-ph])**

Ryohei Kobayashi, Guanyu Zhu

**In-plane magnetic field-driven conductance modulations in topological insulator kinks. (arXiv:2310.06924v1 [cond-mat.mes-hall])**

Gerrit Behner, Kristof Moors, Yong Zhang, Michael Schleenvoigt, Alina Rupp, Erik Zimmermann, Abdur Rehman Jalil, Peter Schüffelgen, Hans Lüth, Detlev Grützmacher, Thomas Schäpers

**Modulating Resonant Electronic Coupling of Tungsten Diselenide Monolayers with Vanadyl Phthalocyanine for Spin-Valley Polarization Control. (arXiv:2310.06979v1 [cond-mat.mes-hall])**

Daphné Lubert-Perquel, Jeffrey L. Blackburn, Byeong Wook Cho, Young Hee Lee, Justin C. Johnson

**Universal and nonuniversal probability laws in Markovian open quantum dynamics subject to generalized reset processes. (arXiv:2310.06981v1 [cond-mat.stat-mech])**

Federico Carollo, Igor Lesanovsky, Juan P. Garrahan

**Many-body Chern insulator in the Kondo lattice model on a triangular lattice. (arXiv:2310.07094v1 [cond-mat.str-el])**

Kota Ido, Takahiro Misawa

**Absence of topological Hall effect in Fe$_x$Rh$_{100-x}$ epitaxial films: revisiting their phase diagram. (arXiv:2310.07140v1 [cond-mat.mtrl-sci])**

Xiaoyan Zhu, Hui Li, Jing Meng, Xinwei Feng, Zhixuan Zhen, Haoyu Lin, Bocheng Yu, Wenjuan Cheng, Dongmei Jiang, Yang Xu, Tian Shang, Qingfeng Zhan

**Temperature-Dependent Collective Excitations in a Three-Dimensional Dirac System ZrTe$_{5}$. (arXiv:2310.07232v1 [cond-mat.str-el])**

Zijian Lin, Cuixiang Wang, Daqiang Chen, Sheng Meng, Youguo Shi, Jiandong Guo, Xuetao Zhu

**Ultimate sharpness of the tunneling resonance in vertical heterostructures. (arXiv:2310.07307v1 [cond-mat.mes-hall])**

Georgy Alymov, Dmitry Svintsov

**Frequency mixing spectroscopy of spins in diamond. (arXiv:2310.07398v1 [quant-ph])**

Mohammed Attrash, Sergei Masis, Sergey Hazanov, Oleg Shtempluck, Eyal Buks

**Superfluidity meets the solid-state: frictionless mass-transport through a (5,5) carbon-nanotube. (arXiv:2310.07476v1 [cond-mat.mtrl-sci])**

Alberto Ambrosetti, Pier Luigi Silvestrelli, Luca Salasnich

**Terahertz s-SNOM reveals nanoscale conductivity of graphene. (arXiv:2310.07479v1 [physics.optics])**

Henrik B. Lassen, Edmund J. R. Kelleher, Leonid Iliushyn, Timothy J. Booth, Peter Bøggild, Peter U. Jepsen

**Iterative solution of relativistic Boltzmann equation in curved spacetime with application to kinetic coefficients. (arXiv:2310.07481v1 [gr-qc])**

Long Cui, Xin Hao, Liu Zhao

**Electronic States in Helical Materials: General Properties and Application to InSeI. (arXiv:2310.07530v1 [cond-mat.mtrl-sci])**

Jiaming Hu, Shu Zhao, Wenbin Li, Hua Wang

**Anomalous quasiparticle lifetime in geometric quantum critical metals. (arXiv:2310.07539v1 [cond-mat.str-el])**

Hao Song, Han Ma, Catherine Kallin, Sung-Sik Lee

**Latent Su-Schrieffer-Heeger models. (arXiv:2310.07619v1 [cond-mat.mes-hall])**

Malte Röntgen, Xuelong Chen, Wenlong Gao, Maxim Pyzh, Peter Schmelcher, Vincent Pagneux, Vassos Achilleos, Antonin Coutant

**Fountains of Flat Bands through Moir\'e Engineering. (arXiv:2310.07647v1 [cond-mat.mes-hall])**

Xiaoting Zhou, Yi-Chun Hung, Baokai Wang, Arun Bansil

**Semiclassical quantization conditions in strained moir\'e lattices. (arXiv:2206.03349v3 [math.AP] UPDATED)**

Simon Becker, Jens Wittsten

**Fast quantum transfer mediated by topological domain walls. (arXiv:2208.00797v5 [quant-ph] UPDATED)**

Juan Zurita, Charles E. Creffield, Gloria Platero

**Pauli topological subsystem codes from Abelian anyon theories. (arXiv:2211.03798v2 [quant-ph] UPDATED)**

Tyler D. Ellison, Yu-An Chen, Arpit Dua, Wilbur Shirley, Nathanan Tantivasadakarn, Dominic J. Williamson

**Geometric phases of mixed quantum states: A comparative study of interferometric and Uhlmann phases. (arXiv:2301.01210v3 [quant-ph] UPDATED)**

Xu-Yang Hou, Xin Wang, Zheng Zhou, Hao Guo, Chih-Chun Chien

**General mapping of one-dimensional non-Hermitian mosaic models to non-mosaic counterparts: Mobility edges and Lyapunov exponents. (arXiv:2301.01711v3 [cond-mat.dis-nn] UPDATED)**

Sheng-Lian Jiang, Yanxia Liu, Li-Jun Lang

**EuCd$_2$As$_2$: a magnetic semiconductor. (arXiv:2301.08014v2 [cond-mat.mtrl-sci] UPDATED)**

D. Santos-Cottin, I. Mohelský, J. Wyzula, F. Le Mardelé, I. Kapon, S. Nasrallah, N. BarišIć, I. Živković, J. R. Soh, F. Guo, K. Rigaux, M. Puppin, J. H. Dil, B. Gudac, Z. Rukelj, M. Novak, A. B. Kuzmenko, C. C. Homes, Tomasz Dietl, M. Orlita, Ana Akrap

**Design of linear block copolymers and ABC star terpolymers that produce two length scales at phase separation. (arXiv:2304.14194v2 [cond-mat.soft] UPDATED)**

Merin Joseph, Daniel J. Read, Alastair M. Rucklidge

**A Chern-Simons theory for dipole symmetry. (arXiv:2305.02492v3 [cond-mat.str-el] UPDATED)**

Xiaoyang Huang

**On the Topological Protection of the Quantum Hall Effect in a Cavity. (arXiv:2305.10558v2 [cond-mat.mes-hall] UPDATED)**

Vasil Rokaj, Jie Wang, John Sous, Markus Penz, Michael Ruggenthaler, Angel Rubio

**Coexistence of extended and localized states in finite-sized mosaic Wannier-Stark lattices. (arXiv:2306.10831v2 [cond-mat.dis-nn] UPDATED)**

Jun Gao, Ivan M. Khaymovich, Adrian Iovan, Xiao-Wei Wang, Govind Krishna, Ze-Sheng Xu, Emrah Tortumlu, Alexander V. Balatsky, Val Zwiller, Ali W. Elshaari

**Selective Manipulation and Tunneling Spectroscopy of Broken-Symmetry Quantum Hall States in a Hybrid-edge Quantum Point Contact. (arXiv:2307.15728v2 [cond-mat.mes-hall] UPDATED)**

Wei Ren, Xi Zhang, Jaden Ma, Xihe Han, Kenji Watanabe, Takashi Taniguchi, Ke Wang

**Accelerating micromagnetic and atomistic simulations using multiple GPUs. (arXiv:2308.08447v2 [cond-mat.mes-hall] UPDATED)**

Serban Lepadatu

**Predicting Psi-BN: computational insights into its mechanical, electronic, and optical characteristics. (arXiv:2308.13112v2 [cond-mat.mtrl-sci] UPDATED)**

F. F. Monteiro, K. A. L. Lima, L. A. Ribeiro Junior

**Dislocation breakaway from nanoparticle array linear complexions: Plasticity mechanisms and strength scaling laws. (arXiv:2308.15744v2 [cond-mat.mtrl-sci] UPDATED)**

Divya Singh, Daniel S. Gianola, Timothy J. Rupert

**Strong relevance of Zinc impurity in the spin-$\frac{1}{2}$ Kagome quantum antiferromagnets: a variational study. (arXiv:2309.04363v2 [cond-mat.str-el] UPDATED)**

Jianhua Yang, Tao Li

**Pair Production in time-dependent Electric field at Finite times. (arXiv:2309.12079v2 [hep-ph] UPDATED)**

Deepak Sah, Manoranjan P. Singh

**Homotopy, Symmetry, and Non-Hermitian Band Topology. (arXiv:2309.14416v2 [cond-mat.mes-hall] UPDATED)**

Kang Yang, Zhi Li, J. Lukas K. König, Lukas Rødland, Marcus Stålhammar, Emil J. Bergholtz

Found 5 papers in prb 2D transition-metal dioxides and dichalcogenides with $1H$ phase ($1H\text{−}M{X}_{2}$) have a large number of members and a wide range of material properties, making them promising candidates for numerous applications. The comprehensive, accurate, and rapid evaluation on the mechanical properties o… We study topological magnons on an anisotropic square-hexagon-octagon lattice which has been found by a two-dimensional biphenylene network. We propose the concept of type-II Dirac magnonic states where new schemes to achieve topological magnons are unfolded without requiring the Dzyaloshinskii-Mori… Quantum inverse problem is defined as how to determine a local Hamiltonian from a single eigenstate. This question is valid not only in Hermitian system but also in non-Hermitian system. So far, most attempts are limited to Hermitian systems, while the possible non-Hermitian solution remains outstan… We study the coupling between topological bands and two distinct magnetic sublattices in ${\mathrm{EuMn}}_{1−x}{\mathrm{Zn}}_{x}{\mathrm{Sb}}_{2}$ $(0≤x≤1)$ using a combination of magnetotransport measurements and density functional theory (DFT) calculations. Hall measurements reveal a low carrier c… This paper focuses on investigating high-order harmonic generation (HHG) in graphene quantum dots (GQDs) under intense near-infrared laser fields. To model the GQD and its interaction with the laser field, we utilize a mean-field approach. Our analysis of the HHG power spectrum reveals fine structur…

Date of feed: Thu, 12 Oct 2023 03:17:06 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **General analytical algorithm of mechanical properties for $1H\text{−}M{X}_{2}$ transition metal dioxides and dichalcogenides**

Dong Li, Junfei Zhao, Yonggang Zheng, Hongwu Zhang, and Hongfei Ye

Author(s): Dong Li, Junfei Zhao, Yonggang Zheng, Hongwu Zhang, and Hongfei Ye

[Phys. Rev. B 108, 144103] Published Wed Oct 11, 2023

**Type-II Dirac points and Dirac nodal loops on the magnons of a square-hexagon-octagon lattice**

Meng-Han Zhang and Dao-Xin Yao

Author(s): Meng-Han Zhang and Dao-Xin Yao

[Phys. Rev. B 108, 144407] Published Wed Oct 11, 2023

**Non-Hermitian parent Hamiltonian from a generalized quantum covariance matrix**

Yin Tang and W. Zhu

Author(s): Yin Tang and W. Zhu

[Phys. Rev. B 108, 165114] Published Wed Oct 11, 2023

**Coupling between the spatially separated magnetism and the topological band revealed by magnetotransport measurements on ${\mathrm{EuMn}}_{1−x}{\mathrm{Zn}}_{x}{\mathrm{Sb}}_{2}$ $(0≤x≤1)$**

Yuanying Xia, Lin Wang, Yuanhao Zhu, Liyu Zhang, Yan Liu, Xueliang Wu, Long Zhang, Tianran Yang, Kunya Yang, Mingquan He, Yisheng Chai, Huixia Fu, Xiaoyuan Zhou, and Aifeng Wang

Author(s): Yuanying Xia, Lin Wang, Yuanhao Zhu, Liyu Zhang, Yan Liu, Xueliang Wu, Long Zhang, Tianran Yang, Kunya Yang, Mingquan He, Yisheng Chai, Huixia Fu, Xiaoyuan Zhou, and Aifeng Wang

[Phys. Rev. B 108, 165115] Published Wed Oct 11, 2023

**Long-range correlation-induced effects at high-order harmonic generation on graphene quantum dots**

H. K. Avetissian, A. G. Ghazaryan, Kh. V. Sedrakian, and G. F. Mkrtchian

Author(s): H. K. Avetissian, A. G. Ghazaryan, Kh. V. Sedrakian, and G. F. Mkrtchian

[Phys. Rev. B 108, 165410] Published Wed Oct 11, 2023

Found 4 papers in prl A new method identifies the most sensitive measurement that can be performed using a given quantum state, knowledge key for designing improved quantum sensors. Two different experiments on two different transition metals reveal that a current of electron orbital angular momentum flows in response to an electric field. Two different experiments on two different transition metals reveal that a current of electron orbital angular momentum flows in response to an electric field. A proposed optical setup combines a Fabry-Perot-type optical cavity with heterodyne photon detection for extracting the topological properties of two-dimensional semiconductor materials.

Date of feed: Thu, 12 Oct 2023 03:17:04 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Optimal Generators for Quantum Sensing**

Jarrod T. Reilly, John Drew Wilson, Simon B. Jäger, Christopher Wilson, and Murray J. Holland

Author(s): Jarrod T. Reilly, John Drew Wilson, Simon B. Jäger, Christopher Wilson, and Murray J. Holland

[Phys. Rev. Lett. 131, 150802] Published Wed Oct 11, 2023

**Magneto-Optical Detection of the Orbital Hall Effect in Chromium**

Igor Lyalin, Sanaz Alikhah, Marco Berritta, Peter M. Oppeneer, and Roland K. Kawakami

Author(s): Igor Lyalin, Sanaz Alikhah, Marco Berritta, Peter M. Oppeneer, and Roland K. Kawakami

[Phys. Rev. Lett. 131, 156702] Published Wed Oct 11, 2023

**Orbital Hanle Magnetoresistance in a $3d$ Transition Metal**

Giacomo Sala, Hanchen Wang, William Legrand, and Pietro Gambardella

Author(s): Giacomo Sala, Hanchen Wang, William Legrand, and Pietro Gambardella

[Phys. Rev. Lett. 131, 156703] Published Wed Oct 11, 2023

**Quantum Optics Measurement Scheme for Quantum Geometry and Topological Invariants**

Markus Lysne, Michael Schüler, and Philipp Werner

Author(s): Markus Lysne, Michael Schüler, and Philipp Werner

[Phys. Rev. Lett. 131, 156901] Published Wed Oct 11, 2023

Found 2 papers in pr_res The study of topological states has developed rapidly in electric circuits, which permits flexible fabrications of non-Hermitian systems by introducing non-Hermitian terms. Here, nonreciprocal coupling terms are realized by utilizing a voltage follower module in non-Hermitian topological electric ci… A class of systems is presented in which a particle-antiparticle pair cannot annihilate each other after they have moved along a loop and instead form a new type of composite particle. This occurs in so-called non-Hermitian systems: classical metamaterials or “open” quantum systems that are coupled to the rest of the Universe. In two dimensions, their excitations are massless “particles” that can be created as a pair or annihilate each other pairwise. Each particle is associated with the mathematical structure of a knot in a rope. After moving one particle along a loop and bringing it near its former antiparticle, their knots are combined differently. The two can no longer annihilate pairwise and instead form a new particle corresponding to a more complicated knot. This shows that non-Hermitian particles in two dimensions remember their movement history.

Date of feed: Thu, 12 Oct 2023 03:17:06 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Experimental observation of non-Hermitian higher-order skin interface states in topological electric circuits**

Bin Liu, Yang Li, Bin Yang, Xiaopeng Shen, Yuting Yang, Zhi Hong Hang, and Motohiko Ezawa

Author(s): Bin Liu, Yang Li, Bin Yang, Xiaopeng Shen, Yuting Yang, Zhi Hong Hang, and Motohiko Ezawa

[Phys. Rev. Research 5, 043034] Published Wed Oct 11, 2023

**Braid-protected topological band structures with unpaired exceptional points**

J. Lukas K. König, Kang Yang, Jan Carl Budich, and Emil J. Bergholtz

Author(s): J. Lukas K. König, Kang Yang, Jan Carl Budich, and Emil J. Bergholtz

[Phys. Rev. Research 5, L042010] Published Wed Oct 11, 2023